Communications: directive radio wave systems and devices (e.g. – Determining distance – Altimeter
Patent
1988-05-20
2000-10-10
Hellner, Mark
Communications: directive radio wave systems and devices (e.g.,
Determining distance
Altimeter
342 82, G01S 1308
Patent
active
061306363
ABSTRACT:
A continuous wave radar system, for example a radar altimeter, comprises a memory (24) for storing an array of return signals, means for performing a time integration (25) of the array to improve its signal-to-noise ratio, means responsive to the time integrated array (26) to compare (30) the noise level (28) thereof with the peak level (27) thereof to obtain the signal-to-noise ratio of the array, and control means (31) responsive to the signal-to-noise ratio thus obtained to set either the period over which the said time integration is performed for each renewal of the time integrated array (26), or the power of the transmitted signal, of both, in accordance with predetermined criteria to the minimum necessary to ensure an adequate signal-to-noise ratio.
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Frank Robert
GEC--Marconi Limited
Hellner Mark
Kunitz Norman N.
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